About a month after I bought Skryim, I used a console command just to mess around and have fun. I have seen that other people have also used console commands and can't get achievements either, but I also see that some still can get achievements after using these commands.

I want to re - activate my ability to get achievements, is there a way?

There seems to be an issue as sometimes the game doesn't register your achievements, no matter if you use console commands or not. I never use them, but still sometimes the achievements doesn't unlock for me, and I have to play an older save to unlock them. This only happened to me with this game. Also, see bugs (at the end of the page) here:

The first time I had this issue were for the first 2 achievements you can unlock at the start of the game: "Unbound" and "Blessed". Now I have the issue again, I reached Level 25 and the achievement "Expert" didn't unlock... :(

Just in case you should keep more than one manual save. I just came back after working again my way to Level 25 from a previous save, and the achievement just unlocked. That took like an hour, because I notice that issue when I was Level 25 and a half... :P